nmdcat.online
BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

58. The presence of a single-ringed nitrogenous base pairing with a double-ringed nitrogenous base across the entire length of DNA ensures that

A. The molecule remains single-stranded
B. The distance between the two backbones stays perfectly uniform
✓
C. Transcription occurs at a highly accelerated rate
D. The helix twists exclusively in a left-handed direction

📝 Explanation

Pairing purines with pyrimidines preserves a constant 2 nm spacing, preventing structural bulges or pinches along the helix.

📖 Additional Information

  • The molecule remains single-stranded
  • The distance between the two backbones stays perfectly uniform
  • Transcription occurs at a highly accelerated rate
  • The helix twists exclusively in a left-handed direction

Pairing purines with pyrimidines preserves a constant 2 nm spacing, preventing structural bulges or pinches along the helix.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

57. The biological term that describes the complete set of all genetic material, including all genes and non-coding sequences, present inside an organism is its

Next Question

59. The specific enzyme that uses a single strand of a gene as a template to catalyze the polymerization of a matching RNA strand is

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →